Errors on user creation through context admin

Hello, first of all many thanks for a great module!

I created a menu tab with page manager and used context admin and the "Create user" page type. I have found two bugs with this.

First issue:
If I put an image field on the user registration form, using context admin I get these errors when uploading the image:

Notice: Undefined index: context_admin_user_create_menu_render_form in drupal_retrieve_form() (line 765 of /includes/form.inc).
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'context_admin_user_create_menu_render_form' not found or invalid function name in drupal_retrieve_form() (line 800 of /includes/form.inc).
Notice: Undefined index: field_profile_image in file_ajax_upload() (line 271 of /modules/file/file.module).
Notice: Undefined index: #suffix in file_ajax_upload() (line 280 of /modules/file/file.module).

This works fine when registering a new user through drupals default "admin/people/create" interface so I'm guessing it's an issue with this module. It might be part of this? #1162890: File Upload AJAX Failure in Local Action Create Node

Second issue:
If I delete the image field and proceed with creating a new user I get these errors:

Notice: Undefined index: administer_users in user_register_submit() (line 3762 of /modules/user/user.module).
Unable to send e-mail. Contact the site administrator if the problem persists.

The user is created but the password I filled in the form is not saved, so the new user can't login. Also, apparently drupal is trying to send an email although the "user notification" setting is not checked, it also happens even if this setting is not included.

Very thankful for some help on these issues, perhaps I'm doing something wrong in my setup?